Putrefying Rotboar 
Creature — Elemental Boar
Lifelink Whenever a Boar you control attacks, each nonland card in defending player's hand perpetually gains "When you cast this spell, you lose 1 life."
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL